mindbux?!

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can someone help me out? i know its probably a major scam and to be honest i don't really plan on using it, but i was just wondering.. when using mindbux, and you click on an advert, it brings you to the advert. you wait the amount of seconds it says and the page is fully loaded. then in two grey boxes it has clicks, and a number.. and it has another larger 3 digit number.. when i click on the grey box sayin clicks and a small number for example 6.. nothing happens. but when i click on the larger number it says invalid image verification?! .. what are these boxes? and am i meant to click on one?